Malicious PDF — malware analysis report

Static analysis result for SHA-256 f999665130713421…

MALICIOUS

PDF

66.5 KB Created: 2020-12-17 16:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 399b79920b4e98ebaea70a9d0ad9f977 SHA-1: 14bc17e99df7eb29e28eb98db3d40141943388ce SHA-256: f999665130713421eb06ad5d77c3c65802db367d97d4a57ad441ac7da54c3f82
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits malicious characteristics, primarily by acting as a link farm. It contains numerous embedded URLs, including one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/aws?utm_term=bluetooth+controller+pc++windows+7
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/jefefowelo_nazepasisedina_refuzixipuzijok.pdf
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/3ce93d6d20b9.pdf
    • https://xuwixozewinufub.weebly.com/uploads/1/3/4/7/134702679/9559764.pdf
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/5038953.pdf
    • https://dakesepev.weebly.com/uploads/1/3/4/3/134308776/wonelefidep-lurazefeb.pdf
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/tojub.pdf
    • https://ridixuzo.weebly.com/uploads/1/3/4/6/134605053/98c8b816734aa.pdf
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/tukanevoni.pdf
    • https://cdn-cms.f-static.net/uploads/4444638/normal_5fa24cdf28349.pdf
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/268fcf3528bdf20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4f2fe6d49a06bb8861cc/1606373168370/cold_steel_trailmaster_carbon_v.pdf
    • https://static1.squarespace.com/static/5fc4c9cf085bf90c0e160b83/t/5fc551babc819f1cf488ec50/1606767035456/50th_birthday_party_favors.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c86d.bin
e859b2b329c77c1013dc90c2a873ca921149af29212d503edb93da45704c03e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 5172 bytes
font_01_sfnt_off0000da1a.bin
bf56de63bb7ea90b67a639074792d663e512c56fb52dd7442d39df412e6786ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10288 bytes

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